I think what's commonly known as 'love at first sight' could be 'attraction at first sight'. And yeah... 'lust at first sight' happens too! hehehehehe!
Maybe, this is chemistry at work at the pheromones level!
When that happens to me, I can feel the heat rising to my cheeks (nooo!! Not THOSE cheeks, stop looking at my butt... THESE cheeks! *points to face... hehehe!
).
My heart also starts to pound in my chest... so hard and so fast I start to feel kinda giddy, with a lot of nervous energy within, like I'm some kinda wound-up spring about to be released.
Sometimes, I start to stammer or I can't make nice, gramatically correct sentences, and then, no one understands what I'm trying to say, which makes me even more self-conscious and my cheeks feel warmer and warmer. At the same time, the increased blood flow to my cheeks makes my fingertips start to feel cold. Then I'll either talk a lot of rubbish or become very quiet and suddenly well-behaved! hehehe!
Then my stomach does that famous butterfly thing and suddenly, my often-voracious appetite becomes tres petite!